502
FNCA52 TJSJ 090828 AAA
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO...UPDATED
NATIONAL WEATHER SERVICE SAN JUAN PR
428 AM AST FRI OCT 9 2026
DISCUSSION
A LOW-TO-MODERATE RISK OF FIRE DANGER WILL CONTINUE ACROSS THE
SOUTHWESTERN COASTAL PLAINS OF PUERTO RICO (MAINLY DURING THE
MORNING) DUE TO BREEZY WINDS AND A DRIER AIR MASS OVER THE
REGION. WINDS ARE EXPECTED TO BEGIN FROM THE EAST-SOUTHEAST (ESE)
IN THE MORNING AND BACK TO THE EAST-NORTHEAST (ENE) DURING THE
AFTERNOON. THIS SHIFT TO ENE FLOW COULD TRIGGER SHOWERS AND
THUNDERSTORM ACTIVITY ACROSS SOUTHWESTERN PUERTO RICO BY THE
AFTERNOON, HELPING TO ALLEVIATE FIRE CONCERNS. WE WILL CONTINUE
TO TRACK EVOLVING WEATHER PATTERNS AND FUEL MOISTURE LEVELS FOR
ANY POTENTIAL INCREASE IN FIRE RISK.
PRZ014-092015-
SOUTHEAST COASTAL PLAINS-
428 AM AST FRI OCT 9 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 10 20
TEMP (24H TREND) 91 (+2) 74 (-2) 91
RH % (24H TREND) 54 (-7) 91 (+2) 58
WIND 20FT/EARLY(MPH) E 16 E 12 E 14
WIND 20FT/LATE(MPH) E 16 NE 10 E 17
MIXING HGT(FT-AGL/MSL)5300 5210
TRANSPORT WND (MPH) E 16 E 14
VENT RATE (KT-FT) 74200 62520
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-092015-
SOUTHERN HILLS-
428 AM AST FRI OCT 9 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 40 0 40
TEMP (24H TREND) 89 (+4) 70 (-4) 88
RH % (24H TREND) 58 (-13) 97 (+5) 61
WIND 20FT/EARLY(MPH) E 12 E 12 E 12
WIND 20FT/LATE(MPH) E 12 NE 11 E 12
MIXING HGT(FT-AGL/MSL)5770 5630
TRANSPORT WND (MPH) E 15 E 15
VENT RATE (KT-FT) 75010 73190
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-092015-
NORTH COASTAL PLAINS-
428 AM AST FRI OCT 9 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 10 30
TEMP (24H TREND) 91 (+1) 75 (-2) 90
RH % (24H TREND) 60 (-8) 96 (+4) 63
WIND 20FT/EARLY(MPH) E 13 E 17 E 14
WIND 20FT/LATE(MPH) E 19 E 11 E 16
MIXING HGT(FT-AGL/MSL)5470 4830
TRANSPORT WND (MPH) E 17 E 17
VENT RATE (KT-FT) 82050 72450
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-092015-
NORTHERN HILLS-
428 AM AST FRI OCT 9 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 30 0 30
TEMP (24H TREND) 90 (+1) 72 (-1) 89
RH % (24H TREND) 60 (-8) 97 (+3) 65
WIND 20FT/EARLY(MPH) E 12 E 16 E 13
WIND 20FT/LATE(MPH) E 17 E 9 NE 14
MIXING HGT(FT-AGL/MSL)5930 5130
TRANSPORT WND (MPH) E 14 E 16
VENT RATE (KT-FT) 71160 71820
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-092015-
WEST COAST-
428 AM AST FRI OCT 9 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY CLEAR PCLDY
PRECIP TYPE TSTMS NONE TSTMS
CHANCE PRECIP (%) 60 0 80
TEMP (24H TREND) 92 (+1) 72 (-3) 92
RH % (24H TREND) 60 (-8) 97 (+4) 63
WIND 20FT/EARLY(MPH) E 13 E 12 E 12
WIND 20FT/LATE(MPH) E 13 E 10 E 12
MIXING HGT(FT-AGL/MSL)4870 5080
TRANSPORT WND (MPH) E 12 E 12
VENT RATE (KT-FT) 48700 50800
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-092015-
EASTERN INTERIOR-
428 AM AST FRI OCT 9 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 30 40
TEMP (24H TREND) 90 (+2) 72 (-3) 89
RH % (24H TREND) 59 (-9) 97 (+4) 62
WIND 20FT/EARLY(MPH) E 12 E 12 E 12
WIND 20FT/LATE(MPH) E 12 E 12 E 11
MIXING HGT(FT-AGL/MSL)6390 5300
TRANSPORT WND (MPH) E 15 E 14
VENT RATE (KT-FT) 83070 63600
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-092015-
LUQUILLO MOUNTAIN RANGE-
428 AM AST FRI OCT 9 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY PCLDY MCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 30 60 60
TEMP (24H TREND) 86 (+4) 70 (-4) 85
RH % (24H TREND) 64 (-9) 99 (+4) 66
WIND 20FT/EARLY(MPH) E 11 E 10 E 11
WIND 20FT/LATE(MPH) E 11 E 9 E 10
MIXING HGT(FT-AGL/MSL)4970 3940
TRANSPORT WND (MPH) E 15 E 14
VENT RATE (KT-FT) 64610 47280
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-092015-
CENTRAL MOUNTAIN RANGE-
428 AM AST FRI OCT 9 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY CLEAR PCLDY
PRECIP TYPE TSTMS NONE TSTMS
CHANCE PRECIP (%) 50 0 60
TEMP (24H TREND) 88 (+5) 68 (-4) 87
RH % (24H TREND) 60 (-15) 98 (+4) 67
WIND 20FT/EARLY(MPH) E 9 E 10 E 10
WIND 20FT/LATE(MPH) E 10 E 8 E 11
MIXING HGT(FT-AGL/MSL)6960 5810
TRANSPORT WND (MPH) E 10 E 14
VENT RATE (KT-FT) 62640 69720
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-092015-
CAYEY MOUNTAIN RANGE-
428 AM AST FRI OCT 9 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 30 50
TEMP (24H TREND) 86 (+3) 70 (-3) 85
RH % (24H TREND) 62 (-11) 98 (+2) 64
WIND 20FT/EARLY(MPH) E 11 E 10 E 10
WIND 20FT/LATE(MPH) E 11 E 9 E 10
MIXING HGT(FT-AGL/MSL)5510 4850
TRANSPORT WND (MPH) E 16 E 15
VENT RATE (KT-FT) 77140 63050
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-092015-
VIEQUES-
428 AM AST FRI OCT 9 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY PCLDY MCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 30 60 60
TEMP (24H TREND) 90 (+1) 77 (-3) 90
RH % (24H TREND) 57 (-7) 88 (+5) 57
WIND 20FT/EARLY(MPH) E 14 E 16 E 14
WIND 20FT/LATE(MPH) E 13 E 16 E 13
MIXING HGT(FT-AGL/MSL)3670 3480
TRANSPORT WND (MPH) E 17 E 17
VENT RATE (KT-FT) 55050 52200
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-092015-
CULEBRA-
428 AM AST FRI OCT 9 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY PCLDY MCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 30 60 60
TEMP (24H TREND) 91 (+2) 78 (-3) 91
RH % (24H TREND) 57 (-9) 87 (+5) 57
WIND 20FT/EARLY(MPH) E 14 E 16 E 14
WIND 20FT/LATE(MPH) E 13 E 16 E 13
MIXING HGT(FT-AGL/MSL)3650 3510
TRANSPORT WND (MPH) E 18 E 18
VENT RATE (KT-FT) 58400 56160
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-092015-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
428 AM AST FRI OCT 9 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS NONE TSTMS
CHANCE PRECIP (%) 40 0 50
TEMP (24H TREND) 92 (+2) 74 (-3) 91
RH % (24H TREND) 55 (-5) 92 (+6) 57
WIND 20FT/EARLY(MPH) E 18 E 13 E 16
WIND 20FT/LATE(MPH) E 19 E 11 E 18
MIXING HGT(FT-AGL/MSL)4970 5500
TRANSPORT WND (MPH) E 17 E 13
VENT RATE (KT-FT) 74550 60500
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-092015-
SAINT THOMAS AND SAINT JOHN-
428 AM AST FRI OCT 9 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 40 40
TEMP (24H TREND) 88 (+1) 76 (-5) 88
RH % (24H TREND) 63 (-6) 89 (+7) 63
WIND 20FT/EARLY(MPH) E 14 E 16 E 14
WIND 20FT/LATE(MPH) E 14 E 16 E 13
MIXING HGT(FT-AGL/MSL)3600 3620
TRANSPORT WND (MPH) E 17 E 18
VENT RATE (KT-FT) 54000 57920
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-092015-
ST CROIX-
428 AM AST FRI OCT 9 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 30 40
TEMP (24H TREND) 90 (+2) 77 (-3) 89
RH % (24H TREND) 62 (-7) 90 (+4) 63
WIND 20FT/EARLY(MPH) E 13 E 14 E 13
WIND 20FT/LATE(MPH) E 14 E 14 E 12
MIXING HGT(FT-AGL/MSL)4640 4600
TRANSPORT WND (MPH) E 17 E 16
VENT RATE (KT-FT) 69600 64400
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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